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首页> 外文期刊>Environmental toxicology and chemistry >FATE AND EFFECTS OF TRICLOPYR ESTER IN A FIRST-ORDER FOREST STREAM
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FATE AND EFFECTS OF TRICLOPYR ESTER IN A FIRST-ORDER FOREST STREAM

机译：一阶森林流中三氯乙烯酯的命运和影响

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摘要

The fate and the effects of triclopyr butoxyethyl ester (TBEE) were investigated in a first-order forest stream. Quantification of TBEE in stream-water samples showed maximal concentration of 0.848 and 0.949 μg ml~(-1) at sampling stations nearest two discrete injection points. Average TBEE concentrations ranged from 0.32 μg ml~(-1) at stations nearest injection points to 0.02 μg ml~(-1) approximately 225 m downstream. Periods of exposure to aqueous TBEE concentrations in excess of 0.001 μg ml_(-1) ranged from 55 min in fast-flowing upstream locations to 120 min at slower, downstream sampling locations. Simultaneous quantitation of triclopyr acid (TRI) residues in stream-water samples indicated that natural degradative mechanisms rapidly converted TBEE to TRI, and that sorption to natural allochthonous materials occurred as chemical pulses moved downstream. Chemical behaviour resulted in short-term, pulse-type exposures to TBEE, with decreasing magnitude and slightly increasing duration in relation to downstream distance. Short-term, low-level exposures generated in this stream treatment resulted in slightly elevated drift (～3- to 4-fold increase) for up to 36 h, but no measurable reductions in abundance of benthic invertebrates. Increases in chlorophyll a concentrations in epilithic periphyton from treated sections indicated short-term eutrophication or growth-regulation effects of the herbicide applications.
机译：在一级森林溪流中研究了旋毛虫丁氧基乙基酯（TBEE）的命运和影响。流水样品中TBEE的定量显示在最靠近两个离散注入点的采样站最大浓度为0.848和0.949μgml〜（-1）。 TBEE的平均浓度范围从最靠近注入点的0.32μgml〜（-1）到下游约225 m的0.02μgml〜（-1）。暴露于TBEE水溶液中的浓度超过0.001μgmL（-1）的时间范围从快速流动的上游位置的55分钟到较慢的下游采样位置的120分钟。同时定量测定溪流水中的三氯乙酸（TRI）残留量表明，自然降解机制将TBEE迅速转化为TRI，并且随着化学脉冲向下游移动，吸附到天然异源物质上。化学行为导致了短期，脉冲式的TBEE暴露，相对于下游距离，幅度减小且持续时间略有增加。在这种溪流处理中产生的短期低水平暴露导致长达36小时的漂移略有升高（约增加3至4倍），但底栖无脊椎动物的丰度却没有可测量的降低。处理过的部分的表皮附生植物中叶绿素a浓度的增加表明了除草剂应用的短期富营养化或生长调节作用。

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